根据印花税法律制度的规定，下列属于印花税纳税人的是( )。A．合同的双方当事人 B

设函数f（x）=xe^x，则（　　）

A．x=1为f（x）的极大值点

B．x=1为f（x）的极小值点

C．x=-1为f（x）的极大值点

D．x=-1为f（x）的极小值点

用括号内所给单词的适当形式填空。

1. Two American                       (visit) will come to our school.

2. We'll learn the ____________ (twelve) unit next week.

3. Why are you so ____________ (forget) , Mike?

4. The yellow River is the second ___________(long) river in China.

5. I'm ____________ (true) sorry to hear that.

6. There are some children ____________ (play) football on the playground.

7. The ____________ (man) names are Li Ping、Wang Lin and Yang Li .

8. This book is mine. That one is____________ (they).

9. The cat wanted to be on the side of the ____________ (win).

10. Three                       (five) in our class are boys.

按风险影响的程度和范围来划分，风险可分为（）。

A、纯粹风险与投机风险

B、财产风险、责任风险及人身风险

C、自然风险、社会风险和技术风险

D、基本风险与特殊风险

邮政运输的基本要求中规定，要在保证（）的前提下降低运输成本。